There is two sorts of USB chargers, active and passive ones. The readers need an active one with a micro connector, 5 !!!! Volts (that is important, 5.15 V will work too, but thats it), and between 500 - 1500 mA of DC output.
Don't know if you could use a quickcharger, do you?
The current should be higher than 500 mA, otherwise the charging will possibly not start. The Sony PRSA-AC1 gives it 1500 mA.
I use the charger that came with my SE Xperia X1 smartphone. Its output is 5V and 700 mA DC. It works perfectly well.
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